296 Mr. Henderson on the difference of meridians^ ^c. 
The above rectification of the observations made to ascer¬ 
tain the difference of longitude between Paris and Greenwich, 
not only adds greatly to the merit of the distinguished 
observers employed in the work, but trebles the value of 
their results by narrowing the extreme range of the experi¬ 
ments from o®-65 to cei. 
THOMAS HENDERSON, 
Edinburgh, 30th March, 18*7. 
ERRATA IN MR. HERSCHEL’S PAPER. 
Page 85, July 20, for " 9 49” 39'‘6 ” read “ 9** 49“ if • 6 ." 
19, — “9 44 so” - “9 54 so-” 
90, 21, —“ 10 26 28-3” -“10 26 38-3.” 
22, Signals No. 6, erroneously set down. As they stand they are 
repetitions of No. 7. 
102, lit for “clock I** 9“ 5 o’'88 ” read “ ly** 9”50’*88.” 
104, 17, — “- 17 32 44*40” - “ *7 32 42 *40.” 
- — — "—18 22 52*48” —“1822 54-48.” 
109, line lo from bottom, for ** or” read “ on.” 
111, — 7 from top, for “ — ” read “ x •” 
— — 12,- for “ z ” read “ Z.” 
iig, July tg, for “ C' f 46” 36*-65 ” read “ f 46“ 33*-65.” 
120, — 22, line 2d from bottom, for — 3*-03 ” read “ o’-oj. 
